/*
 * Distributed as part of mchange-commons-java 0.2.11
 *
 * Copyright (C) 2015 Machinery For Change, Inc.
 *
 * Author: Steve Waldman <swaldman@mchange.com>
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of EITHER:
 *
 *     1) The GNU Lesser General Public License (LGPL), version 2.1, as 
 *        published by the Free Software Foundation
 *
 * OR
 *
 *     2) The Eclipse Public License (EPL), version 1.0
 *
 * You may choose which license to accept if you wish to redistribute
 * or modify this work. You may offer derivatives of this work
 * under the license you have chosen, or you may provide the same
 * choice of license which you have been offered here.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received copies of both LGPL v2.1 and EPL v1.0
 * along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
 * If not, the text of these licenses are currently available at
 *
 * LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 *  EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php 
 * 
 */

package com.mchange.util.impl;

import com.mchange.util.*;

public class CircularListQueue implements Queue, Cloneable
{
  CircularList list;

  public int     size()               {return list.size();}
  public boolean hasMoreElements()    {return list.size() > 0;}
  public void    enqueue(Object obj)  {list.appendElement(obj);}
  public Object  peek()               {return list.getFirstElement();}
  public Object  dequeue()  
    {
      Object out = list.getFirstElement();
      list.removeFirstElement();
      return out;
    }

  /**
   * Returns a <B><I>shallow</I></B> copy. The queue is
   * cloned, but not the elements within it.
   */
  public Object clone()
    {return new CircularListQueue((CircularList) list.clone());}

  public CircularListQueue () 
    {this.list = new CircularList();}

  private CircularListQueue(CircularList list)
    {this.list = list;}
}
